Dobby multiplier



Aug. 1, 1928.- 6 1,679,663

V. H. JENNINGS ET AL BOBBY m'rxi msa Filed June 21. 1926 2 Sheets-Sheet Aug. 7 1928.

' 1,679,663 v. H. JENNINGS ETAL DOBBY uuL'rIPLII-JR Filed June 21, 1926 2 Sheets-Sheet 2 Patented Aug. 7 1928.

UNITED STATES PATENT OFFICE.

vroToR H. JENNINGS AND HERBERT H. WATSON, 0F WORCESTER, MASSACHUSETTS, .x's- SIGNORS To CROMP'ION & KNOWLES LOOM WORKS, or WORCESTER, MASSAcnm sETTs, A CORPORATION OF MASSACHUSE TS.

DOIBBY MULTIPLIER.

Application filed June 21,

This invention relates to multipliers of the generaltype used in connection with loom (lobbies and which are adapted to control the motions of the drop boxes and to reduce the length of pattern chain required thereby. This general. type of multiplier is well known in the art but as heretofore built has embodied certain constructions which have proved more or less troublesome in actual use.

i It is the general object of our invention to improve the construction of such multipliers in certain important respects by which these objectionable features are avoided and the utility of the multiplier is increased.

)Vith this general object in view, important features of our invention relate to the provision of an improved construction by which certain related parts of the multiplier may be easily adjusted as a unit relative to other parts thereof; to the provision of an improved drive and an improved support or bearing construction for the pinion shaft of the multiplier, and to the provision of means effective to prevent breakage when normal operation of the multiplier is prevented.

Our invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A. preferred form' of the invention is shown. in the drawings in which Fig; 1. is a side elevation, partly in section, of our improvedmultiplier; h

Fig. 2 is an end view, looking in the direction of the arrow 2 in Fig. 1; and- Fig. 3 is a sectional elevation, taken along the line 33 in Fig. 1.

Referring to the drawings, our improved -multiplier comprises frame members 10 and 11 in which a cylinder shaft 12 is freely rotatable. The shaft 12at one end has a bearing block 13 which is adjustable vertically and horizontally in a recess in the frame member 11 by set screws 14 and 15 (Fig. 2).

The shaft 12 is also supported in a bearing block 16 which is similarly adjustable vertically and horizontally in a recess 17 of the frame member 10, such adjustment being accomplished by means of set screws 18 and 19 (Fig. 3). A large gear 20 is secured to one end of the shaft 12 by a set screw 21 and 1926. Serial o. 117.249.

is engaged-by a pinion 22 on a short horizontal shaft 23 which is connected by bevel gears 24 and 25 witha continuously rotated shaft 2 1, so that the gear 20 may slip on the shaft 12 if normal rotation of the shaft 1.2 is

prevented. The multiplier is thus effectively prevented from accidentalv injury by the provision of the yiel'dableset screw 21.

A cylinder 28 (Fig. 1) for the harness levers is fixed to the shaft 12 and rotates in unison therewith. A drop box pattern chain cylinder 30 is formed on a sleeve 31 which is freely rotatable upon the shaft 12 and which is provided with a star wheel 32 adjacent one end thereof. A multiplier chaincylinder 35 is similarly mounted on a sleeve 36' freely rotatable on the outer end of the shaft 12 and provided with a star wheel 37.

A pinion shaft 38 rotates freely on a bearing 39 in the lower part of the bearing block 16 and is provided with a second bearing 40, formed on the end of anarm 41 projecting laterally from the lower portion of the hearing block 16. The pinion shaft 38-is provided With a pinion 42 fixed thereon and engaged and rotated by a gear 43 fast on the cylinder shaft 12. i

A pin gear 45 is keyed tothe pinion shaft 38 and is provided with .two driving pins 46, one of which is adapted to engage the star wheel 37 at every half revolution of the pinion shaft 38. A second gear 48 (Fig. 3)

,is similarly keyed to the pinion shaft 38 and is provided with pins 49 for engagement with the star wheel 32.

Each of the pin gears 45 and 48 is slidable axially into and out of position for en gaging its star wheel. 37 or 32 by levers and connect-ions controlled from the multiplier and boxcmotion chains in theusual manner, this controlling mechanism forming no part of our present invention.

The outer ends of the shafts 12 and 38 are held in definite spaced relation by a connecting link or floating bearing member 50 (Fig. 1) and'the link 50 is held from axial dis- .placement by a collar 51 on the shaft 12.

Having described the details of construction of our invention, the advantages thereof are believed to be clearly apparent. The shaft 12 is rotated regularly by the gear 20 unless normal operation of the multiplier is prevented. In such case, the yielding set screw 21 allows the gear 20 to rotate Without turning the shaft, thus protecting all parts of the multiplier mechanism. The sleeves 31 and 36 are mounted at each side of the frame member 10 and do not extend through the bearing block 16, so that no binding of the sleeve in the bearing can take place. The drive for the pinion shaft- 38 is taken directly from the shaft 12 through the gears 42 and 43 and the pinion shaft 38 is supported in spaced bearings 3.9 and 40, both of Which are fixed on the bearingbloek 16, so that adjustment of the block 16 Wlll not change the spaced relation between the shafts 12 and 38.

The provision of double pins 46 and 49 for the pin gears and 48 permits the pinionv shaft to rotate at one half of the speed Whi 11 has been heretofore necessary When a single pin was used. Accordingly the pins when engaging the star Wheels are moving at only one half of the previous speed and the shock of the engagement is thereby greatly reduced.

While our improvements relate to details 7 of construction, the sum total of their effect is very in'iportant and results in the production of a (lobby multiplier which is more manufactured and much more easily kept in satisfactory Working condition than has been heretofore the case.

Having thus described our invention and the advantages thereof, We do not Wish to be limited to the details herein disclosed otherwise than as set forth in the claims, but What We claim is 1. In a. dobby multiplier, a frame, a. cylinder shaft, a bearing for one end of said shaft adjustably mounted in said frame, a pinion shaft disposed parallel to said cylinder shaft, and a bearing member provided with a second bearing for said cylinder shaft and with a bearing for said pinion shaft, said bearings being fixed in definite spaced reverses relation and said bearing member being adjustable as a unit in said frame.

2. In a (lobby multiplier, a frame, a. cylinder shaft, a bearing member adjustable in said frame and having a bearing for said cylinder shaft, a pinion shaft mounted'parallel to said cylinder shaft and having a bearing in said bearing member, and a second bearing for said pinion shaft mounted upon an arm projecting from said bearing member.

3. In a (lobby multiplier, a frame membar, a cylinder shaft extending through said frae'ie member, a drop box pattern chain cylinder, a sleeve and star Wheel for said cylinder rotatable on said cylinder shaft at one side of said frame member, a multiplier c linder, a sleeve and star Wheel for said multiplier cylinder rotatable on said cylinder shaft at the opposite side of said frame mcn'iber, a pinion shaft extending through said frame member, and pin gears on said pinion shaft mounted at opposite sides of said frame inen'iber and positioned for selectively engaging said star Wheels.

4. In a dobby niultiplier, a frame member, a. cylinder shaft extending through said fran'ie member, a drop box pattern chain cylinder, a sleeve and star Wheel for said cylinder rotatable on said cylinder shaft at one side of said frame member, a multiplier cylindcr, a sleeve and'star Wheel for said mult-iplier cylinder rotatable on said cylinder shaft at the opposite side of said frame member, a pinion shaft extending through said frame member, and pin gears on said pinion shaft mounted at opposite sides of said frame member and positioned for selectively engaging said star Wheels, said pin gears each having two engaging pins and.

said gears being set to cause said pins to engage said star wheels alternately and at substantially 90 degrees intervals.

fn testimony whereof We have hereunto aflixed our signatures."

VICTOR H. JENNINGS. HERBERT H. WVATSON. 

